tiramisu/tiramisu/storage/dictionary/storage.py

# -*- coding: utf-8 -*-
# Copyright (C) 2013 Team tiramisu (see AUTHORS for all contributors)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# ____________________________________________________________
from tiramisu.i18n import _
from tiramisu.error import ConfigError


class Setting(object):
    """Dictionary storage has no particular setting.
    """
    pass


setting = Setting()
_list_sessions = []


def list_sessions():
    return _list_sessions


def delete_session(session_id):
    raise ConfigError(_('dictionary storage cannot delete session'))


class Storage(object):
    __slots__ = ('session_id', 'values', 'settings')
    storage = 'dictionary'

    def __init__(self, session_id, persistent):
        if session_id in _list_sessions:
            raise ValueError(_('session already used'))
        if persistent:
            raise ValueError(_('a dictionary cannot be persistent'))
        self.session_id = session_id
        _list_sessions.append(self.session_id)

    def __del__(self):
        try:
            _list_sessions.remove(self.session_id)
        except AttributeError:
            pass